text: /* Operating system specific code for generic dynamic loader functions.
     Copyright (C) 2009-2017 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <http://www.gnu.org/licenses/>.  */
  
  #include <endian.h>
  #include <stdint.h>
  
  static inline uintptr_t __attribute__ ((always_inline))
  _dl_setup_stack_chk_guard (void *dl_random)
  {
    union
    {
      uintptr_t num;
      unsigned char bytes[sizeof (uintptr_t)];
    } ret = { 0 };
  
    if (dl_random == NULL)
      {
        ret.bytes[sizeof (ret) - 1] = 255;
        ret.bytes[sizeof (ret) - 2] = '\n';
      }
    else
      {
        memcpy (ret.bytes, dl_random, sizeof (ret));
  #if BYTE_ORDER == LITTLE_ENDIAN
        ret.num &= ~(uintptr_t) 0xff;
  #elif BYTE_ORDER == BIG_ENDIAN
        ret.num &= ~((uintptr_t) 0xff << (8 * (sizeof (ret) - 1)));
  #else
  # error "BYTE_ORDER unknown"
  #endif
      }
    return ret.num;
  }
  
  static inline uintptr_t __attribute__ ((always_inline))
  _dl_setup_pointer_guard (void *dl_random, uintptr_t stack_chk_guard)
  {
    uintptr_t ret;
    if (dl_random == NULL)
      ret = stack_chk_guard;
    else
      memcpy (&ret, (char *) dl_random + sizeof (ret), sizeof (ret));
    return ret;
  }
  